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Optical identification of binary pulsars: Implications for magnetic field decay in neutron stars

Kulkarni, Shrinivas R. (1986) Optical identification of binary pulsars: Implications for magnetic field decay in neutron stars. Astrophysical Journal Letters, 306 (2). L85-L89. ISSN 2041-8205. http://resolver.caltech.edu/CaltechAUTHORS:20130312-151227505

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Abstract

We report the discovery of the optical counterparts of two binary pulsar systems-0655+64 and 0820+02. In accordance with stellar evolution scenarios we find the optical counterparts to be white dwarfs. The existence of a cool and therefore old white dwarf in the 0655+64 system contradicts the standard hypothesis of exponential decay of magnetic fields in neutron stars. We resolve this contradiction by hypothesizing that the magnetic field in neutron stars consists of two components-an exponentially decaying field and a steady field. The former probably resides in the crust and the latter perhaps in the core: The consequences of this hypothesis for the lifetimes of millisecond pulsars, binary pulsars, and galactic bulge X-ray sources are discussed.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1086/184711DOIArticle
http://adsabs.harvard.edu/abs/1986ApJ...306L..85KADSArticle
ORCID:
AuthorORCID
Kulkarni, Shrinivas R.0000-0001-5390-8563
Additional Information:© 1986 American Astronomical Society. Received 1986 January 22; accepted 1986 April 22. Based in part on research done at Lick Observatory, University of California. I am much indebted to Drs. M. Schmidt and D. Schneider for Hale 5 m data and my friend Dr. S. Djorgovski for superb seeing KPNO 4 m data With great pleasure I thank Dr. A. Klemola for assistance with astrometry, Dr. G. Bothun for help with GASP, and Dr. H. Spinrad for discussions about the optical data. I am grateful to Dr. J. Greenstein for showing me my way around white dwarf literature. Finally I would like to thank Drs. D. Backer, R. Blandford, C. Heiles, E. van den Heuvel, and R. Romani for discussions which led to considerable improvement in this Letter. This work was supported in part by NSF grant AST84-16863 and a Millikan Fellowship.
Funders:
Funding AgencyGrant Number
NSFAST84-16863
Caltech Millikan FellowshipUNSPECIFIED
Subject Keywords:pulsars, stars: binaries, stars: white dwarfs
Record Number:CaltechAUTHORS:20130312-151227505
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20130312-151227505
Official Citation:Optical identification of binary pulsars: Implications for magnetic field decay in neutron stars Kulkarni, S. R. Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 306, July 15, 1986, p. L85-L89.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:37479
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:12 Mar 2013 22:54
Last Modified:30 Oct 2017 23:31

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